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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa6b0e92b4534a5ba398f7477583a4dda04d8417a3de953cea7f1e9d7ab9b47' 
  AND token = 'C3nqc8ra3Oypg8Raomkup8LTl64gwNr4KnEJmk1Vn1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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