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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e5621b868b4310a9ed434b4269cd7afbe0b8c6d5afa062bb296c85645fbe6b' 
  AND token = 'Vmc063qK0QUZGbI47A8RQYe+bHB9qzlTqs4tuFITfK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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