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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9e544a7ecaea8e8539158446df1d8dde5792683e89dc8c15ed062c4583c532' 
  AND token = 'ENCdITUaoyhV7raU8j0jN/7K4HLoPfsSLGD+/f+Ak+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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