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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ecdc6a3637bda9fd11878f4a4a36c98a535d71ff6433edf927afb3d72bb5a3a' 
  AND token = '7Hos5Kk5aO/eeXyGoK/7bvBotAvUSCiKNkmaij5FaWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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