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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6132d383631e6624d62bb430665ad5c4babdf53676dfb8c6a5d7ab8d8d66461a' 
  AND token = 'N319K7BXS3sz/Yd5+0HpDUAefqhsOYvdTu+BHQrb4J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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