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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93383a07d361b050dd4d1f8c1cce0a34ea6bb5e8cdb84d3ef1d6f3e712a9cd1a' 
  AND token = 'TsfNBaa9QAaAl34mS8IIW6qxZX7l+Ixnm+t44kTM070=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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