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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e8169c5911bb90de77d61b5ce9bc1e242934335878b88ca25fb896da75eae3' 
  AND token = '4BkX48F+JPGYT6+tuNoskuQ0oWuMbw+wXjgaZwOe+Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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