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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6923b4c26e15080329d1e562b336fa3adaa89f6d3d053ea69db16ebd4b5b6b5c' 
  AND token = 'zn8wPzcredClUPeHbWzgvcARFFkPy0KQ0OqMWcniZP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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