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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f239fae6d670c108f472b8fabdefae07bd1e557c53d9373f1a62aa76bd8957' 
  AND token = 'Tjx8FLxKAMd77g/u8QRg7G+oaNoD7vdCZfjRE4v/618=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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