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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddccf5c5220bdc2da41782db9b2c16b840623b1337141958d2a9f53d0ae4e05f' 
  AND token = 't20xy6udEB37ZYki3x/KFvI5LURQyA+iY9ZqiqOzCvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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