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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda7c83ec1833cc7f4e9ecfc8f48533fc1c5f1d6fbc8ee9a8281ec4b4d09a609' 
  AND token = 'ieBN5yWGUphW9FVEEYOT1FHg1XBsGbf0eIr3ktd3uFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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