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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c719bf2b6a61a56398bbf66444ef3aba827dad8642d1ecb564da1d86d4cda70' 
  AND token = 'Psu9aTuwkIYkWEMFiRnAYCGh8zN9VlN4LHJY4IB9W6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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