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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670e290092be0a4462b8264506f0434c49456edb5fae5d351a334528f75885a7' 
  AND token = 'C6goEJjCuWEoLZDuST9HTmEVKmH9kLy6O9refLkQGPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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