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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4a4eadce9bbb83c9c81ba5de50eea544fdaf689769f08fa93bb47435ef8ddd' 
  AND token = 'C55/T3+uzCAmAbJepslkGUA3wmBSj1GEGZVOk8ymaB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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