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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf82f0352abc9100fecccc743098074b3991bd6fd0ae76b5dfbf77c81816dd01' 
  AND token = '1mjZoFQZBbv2r5H6G02uxxhnS6f3dDscTF5NendUPyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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