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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137e9a5e02f847ed394a9b4cb79ccb324501ec64a6404d68aaa9362c6b4a8edd' 
  AND token = 'AgJ0CzceOy72cygJ+AL9y4mg36okS50QvM0zEU4pW6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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