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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b3a91927a057f02e2c8a63b55d575c5dc5bc173889bfc40835523fd405a43' 
  AND token = 'lqV5ldnPgZ+iwsLQGacEKL4fWaneo5PvH3QAHMDja4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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