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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b54faba763150f216c7768c3d7b7f603e7d73ff0afd0a61b86f4c139d49438' 
  AND token = 'CX1uXGCoLFJa9kEw80G57v1/z+nSakbtAXnZi1eF96M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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