SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9009997d82cc5045007b5e86fac733351471106ed6325645af0bc7a258312069' 
  AND token = 'fq89QpuYxvReUHGN1NgnUjYPGDCurdKZ68fSkluV1Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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