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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f14177701759fa00ebadd23f82dc8632c40c387e0345fe78a6c7d08114c7ae' 
  AND token = '02vbccSIA+2ebnJgb5tuuT4NmVPAd+P0Lpg6bo2igAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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