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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8590cfac3f12619f537592db1ef8f1d4de6eaa4055b7d2496281ae4ef36eb1c' 
  AND token = 'w5xSORWMP0MgLa6miCvVkVzka0fyI4Z0I9/m6wi/g74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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