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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1559f34560bf0e2af02dc344dfecf278089eaefa6b8af5cb3cb137d2508960e7' 
  AND token = '+m37nzW3Qi9Hl6mRe/TAHzuJx+M8gkslnrKSQywHbVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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