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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e082a39cda2c4e72b1ce5f7092b841932608be8a55e3c798638cd486591cc87' 
  AND token = 'BDUgOeCb0gj8fAJ8O6DxW/NXqyqz6PKilhrDmF8D8zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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