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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87804e68da7fc8886f8330eb9cdc9e4042b2c9c8785b35389ce974910803c2ef' 
  AND token = 'vSwbF43+AaNilxfQiY0Ejqhrb5uLGJCJtl/PM1cT0Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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