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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd39f3596c21e3d97834d9c060c656c7e81c93266600e72fbba7a052756e53af1' 
  AND token = 'l7LzOmNnGJuFCimzvp1cuW6wRgiTWk1QAnDzFwh4LUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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