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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7558efec35c209937bf1b518f01bc21bec137f09863c4ffcfe49cb04490321c0' 
  AND token = 'uPdWEmqaFgzPuW0J3zJplo1gtqQY8PoLDcL5VxCYzow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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