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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff9e6458dd5f776bb789b663e3890d1f392a27f3e709d19062b6f298ac456ba' 
  AND token = '7AMrRXojEyggzXcIGAdSUnAcFvrKvm1A39Q5rM0E/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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