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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdbf7a38f4f735e75bfcef2781a5d4f1f57a854381901f8298df81c053bcedcb' 
  AND token = '79ZMDRck6v0cCFxE84yUcaqOC4N3WDVoD64Bp5lTgCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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