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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dde22a401e5e0f6090fdd7f5d74a8804573123b6d7182c58145bc01c3c34463' 
  AND token = 'hvlxP1/bejrWO2oqLRu/Fzi+z5m6MAdpq8Dx+WEuVQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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