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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1ca661af4dc92cb798dc906f2935501dca16a9ab62c26edc3db69b71709a38' 
  AND token = 'gEslf5dD2RBOHhLeiZsL4BxOTpTGf4y8Vw5ZCovXVag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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