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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995ed78b0ef7d8128406bbf22c9c358569bb491a283f115530ecd98c57f78e56' 
  AND token = 'RpntEU8u8pHPVi+LT40no7bWRah1MZL8vEYB70bDdP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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