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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62dec710d262c3e2171edf0ef9b95ccff46111271de251fe5c97dfb23c6031e5' 
  AND token = 'At9rb8MnnlsC5vh9piH8wtmG1kgwYejKV6QUu2DVVvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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