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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f316d723561cf76f863e8187c7a2e0d0a69950b2e1e7c2e6a6e8bf79081f2e' 
  AND token = 'W5oQHijRbf0rOs+dAS9DQe5bLz5jjMiipE2UDIYC3iA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}