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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9be12c0dbc4313a9bbf5f031941ca0c1bb973ef985c60821a30bfec8d36dc1' 
  AND token = 'V2Z1gPD7Uf36JWqyd749Rlphb0ZwymIAVHQ4naHdyh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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