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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af028c0bb3bbccf6edd34dc3992ef946dbb5ed4dc7135ca0bcc182e6ee18858b' 
  AND token = 'tNlzkkUnqU3jdPLDcKGUSGCa7daB4WV10YAe9o20FXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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