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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eb5038d9f0d282823d1ff410078b0313a3c33892232422a31dfd4ebc2d3c8b6' 
  AND token = 'ZiVJE74wiytcTzY3ofZyKiZFlHn8sy95PaKCXZPqfbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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