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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ec75a6435e3bb15a001ce803c243b665a9ad014bb19648e7fa9fdfeee27150' 
  AND token = '4pj2STkBsfjKfxvGE6jvga901oHoJm7fwn1Dm5uyv3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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