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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf50f44fdef0ffbba76be3930684cceb34dc9dff5561b830b2f8304e57e8ecd' 
  AND token = 'RzQXbAaSfGmjOAMj7DPiv7XTdN8N7dZnq4XuM/BWXvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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