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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb03205dcbcc70ef541fdb09e65265e335375d21e6af5cf7651723e8839d1f5' 
  AND token = 'gmY72rHn4PaY7ft5L/2upxp6Vdw/U2azbs1ndREvUp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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