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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fccd33f24349aa5aa6cc0d825d7da152b0a0cd36b8b1d68ab45bfacb3e0169c6' 
  AND token = 'ZFJRAymb1IGEhHSH5YpVjfF9YaimktIORqZNCp3XLZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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