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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1471ba27734835b5abb655fc3feb05176001e2dd903e49aab64d1e8dbd175b5b' 
  AND token = '4/Lu3EmB5xubgiS0jTKZqYWVePph6WbcXYe3J3a9+yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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