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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d83cbeb397177a35fe80db1dc2f3a4ce2761cc86aab69c60059335e16c3262c' 
  AND token = 'iuZr7/Hbz/Mg+iqNSrXsP1Mll2knYBWJMndiMz0tfwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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