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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319451f71b595815fdce4e0d23e019aa541907c9856f164d4c8ca6074f12bed7' 
  AND token = 'MvFYwzegbcdkpayIY2Yyl55QiOxLA5pFGl5wwgJJ9pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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