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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ec7b4ebcf3887fc684068e4d6ed1d174119d23f18708a4242b91c5b3f7f1d99' 
  AND token = '7l3X/U0kWtNJD8X32edkkvjAi/RgB1SRJCRB14JPiC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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