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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b485b18b4e3ac964a7a3f530b6d0a87c9f94aaae22746f4445500d0333b4c2' 
  AND token = 'Q6mdck1XfMbtngstR29tEiEFoyv2lk96lAuJinZQKjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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