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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fadcb08318185e03962ac978387ff20c36b2e8ff9829cf3989a2732f0d3deb' 
  AND token = '9P5yWre44h1NAb6GbWVLYqUq1xvieDMKDl2OoI+ONbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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