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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d7557fe26650cc2015f69af5a2f80a490aafd20ff442bf952abe64828e7573' 
  AND token = 'KqEJFh0TkOtqB8yRo9O403sN66K6UaRhwHns39yLYSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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