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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602415bc926225196b4d89521bec5d3d380aa22fff4edf105bd3815b86653e03' 
  AND token = 'N2Op8s/DVQ0W1G+/z9gk+S50Ux1pXkiBeHisAChstT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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