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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8670d759ff253cee5a1ed36c3a97229c4a2415c579fea24bf00884ee7002651e' 
  AND token = '6C8a0JF4MqmDQkpTrQrWWdxLHrvNPNSHL6RvynsOvYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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