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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a909d0b8091d911ba8b5b33104b998fe9e6f2469f91885a15027e8a6df642cd3' 
  AND token = 'S5v1omIIE4i3Z8Rr1dJDBQR/Zg6jxhhsKAzX0EtewIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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