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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f29bc25b4976db5199897f5c8fccd99625cf056fb08a26b0114d69ef32dbe8d' 
  AND token = '6FCslwvG7pn5caal8Z+fixd4KWLwEa2b4FiXqkee6Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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