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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b8c55839a98ae368a16957a570c1a665a50b776c15ec6d5c50bc5d9de2a27d' 
  AND token = 'waxC6t18f32gExYQOtcIrNIzl8N05l8n4nbt/3F68Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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