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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a19ef108e307960aa686b60610b23fea958af7d1d693809988f2f9a10be8d5e' 
  AND token = '8cITzC/2IAW+1Nw12aSDRFjd7J/9+lno9BtRyc8p+6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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