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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640411f9d1acb82ab3f91737d3c32e6dd511c38272460759854253e7a8f70998' 
  AND token = 'tuLRFvDkA3j6jNoTYcUnPqfebMqdLdnf2oeK0Dr9dH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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