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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f75db1804aa4b66dbb6445817b6cee6988e08a9d2e3de5bc6b9e4d2b96be9e' 
  AND token = 'tHQxoQ7OxSZvLR12hqZ3kGYI89FTDl26mZDDB606u/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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