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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c859de11c4c0d58974a85d2c11328dee9d7064752ef419a3bffaeea8380bf75a' 
  AND token = 'jeJTaIEDmytd7lUzKyh2EfdZvHtErfFyOCgYlaXEA0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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