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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdaa39306de3f2b5953afbacd45667772d5b6735454f11dd41761e02d8ad696c' 
  AND token = 'tQ/4fERethiOlJa2xcf2V25rSuRCBgpmSQcn85kuEO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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