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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba1421af5d1e91f68329a586a87fd2d752074a63f047cd524b7784407333266' 
  AND token = 'w3k03UFP7Vr4SgjqifpTlGD9jx08lD65Wr0h4xTYUkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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