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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe283caadea4b13601b575a8a3e535e9c9be8be3dea2a32789bdd4fe464d184c' 
  AND token = 'ALuKFGr223hEpLMkZW0o9X24Tubvrd8KHxozsioRuWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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