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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ac903c7b6dd813875fb774232225e1c95364795c5682673c3ba254d4de50ee' 
  AND token = '4L2uw8evJO9X0GyKh3n+FEYMxQHh94JvHFjwIaM4oJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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