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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc33f435c9f763e12ec3013be8d8446626dac9dc22af8cc37b8a83f31c90561' 
  AND token = '8uqTGgu7gXqZKyTGWfN+PQZ3ibxWn4LjBf84mmigoP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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